Purpose: To develop a model for designing digital networks at the intersection with other digital railway transport systems that operate using the LTE-1800 TDD standard. Methods: Collection, analysis and generalisation of scientific and technical information and existing solutions; mathematical and software modelling. Results: This paper presents the results of creating a digital network design model at an intersection with an adjacent digital network operating in the LTE-1800 TDD standard. This model was developed using computer simulation in the Albatross-Zone CAD system. The model considers all kinds of interference affecting the designed network, including external and internal sources such as adjacent and combined channel interference and intermodulation interference. The programme simulates the operation of the system with different base station configurations, enabling analysis of the system's performance in the event of joint operation with adjacent systems. Mathematical modelling was also performed to calculate the range of radio communication with various LTE-1800 TDD standard signal-code designs. The results obtained were similar to those of the computer modelling. Conclusions have been drawn regarding the applicability and operability of this design model. Practical significance: The proposed model for designing a digital network at points of intersection with other digital railway transport systems of the LTE-1800 TDD standard can be used for the development and design of high-speed railways, including railway digital radio communication systems, if necessary.This model will facilitate the analysis of the feasibility of utilising a 10 MHz bandwidth and draw conclusions about the applicability of this model for a specific case.